Study on gas turbine performance by nitrogen injection for IGCC power plant

The Integrated Gasification Combined Cycle (IGCC) has always been a great option to follow the stringent environmental policy as compared to a conventional power plant. The study comprises of gas turbine performance by injecting the nitrogen gas at high temperature and pressure to investigate the overall output of IGCC system. The injection rate studied separately for gasification of coal and gas turbine. In both cases, it was observed the nitrogen injection poses a remarkable effect to steam turbine efficiency. It has been observed that the increment in the nitrogen injection increases the overall performance of the system. However, the efficiency of the steam turbine is lower when nitrogen is injected into the gasification unit only. The injection of N2 reported suitable for gasifier up to 0.1% as a transport medium of coal. For both cases, the net efficiency of the plant remains the same but the caloric value of syngas dramatically reduced by N2 injection. The power output of steam cycle greatly affected by nitrogen induction.